SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Poster Session IV: Organic molecules on inorganic substrates: networks and overlayers

O 47.4: Poster

Dienstag, 2. März 2021, 13:30–15:30, P

Functional 1D template to drive the assembly and alignment of polycyclic molecules — Valeria Chesnyak^1,2, •Marc G Cuxart¹, Knud Seufert¹, and Willi Auwärter¹ — ¹Physics Department E20, Technical University of Munich, Garching, Germany — ²IOM-CNR Laboratorio TASC, Trieste, Italy

Two-dimensional (2D) materials grown on metal substrates constitute excellent platforms to engineer the properties of organic molecules and molecular arrays [1,2]. Moiré superstructures emerging from the combination of distinct symmetries and periodicities of metal surface and 2D layer can guide the self-assembly of molecules, while the nature of the 2D layers and their interfacial properties determine the electronic (de)coupling between molecules and metal.

Here we present the formation of a one-dimensional (1D) template resulting from the growth of a 3-fold symmetric hexagonal boron nitride (hBN) layer on a 4-fold symmetric Ir(100) surface. Its functionality is probed by subsequent deposition of pentacene molecules and comprehensive characterization by STM, STS, LEED and XPS measurements. This reveals a linear alignment of individual molecules, shows that the templating functionality originates due to a 1D modulation of the work function, and indicates an electronic decoupling of the molecules from the metal. This system represents a suitable 1D template that provides prospect for the study of arrays of aligned molecules and other low-dimensional nanostructures.

[1] W. Auwärter, Surf. Sci. Rep. 74(1) (2019)

[2] A. Kumar et al., Nanotechnology 28(8) (2017)